/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package javax.swing.colorchooser;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import sun.swing.SwingUtilities2;

/**
 * The standard preview panel for the color chooser.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Steve Wilson
 * @see JColorChooser
 */
class DefaultPreviewPanel extends JPanel {

    private int squareSize = 25;
    private int squareGap = 5;
    private int innerGap = 5;

    private int textGap = 5;
    private Font font = new Font(Font.DIALOG, Font.PLAIN, 12);
    private String sampleText;

    private int swatchWidth = 50;

    private Color oldColor = null;

    private JColorChooser getColorChooser() {
        return (JColorChooser) SwingUtilities.getAncestorOfClass(JColorChooser.class, this);
    }

    public Dimension getPreferredSize() {
        JComponent host = getColorChooser();
        if (host == null) {
            host = this;
        }
        FontMetrics fm = host.getFontMetrics(getFont());

        int ascent = fm.getAscent();
        int height = fm.getHeight();
        int width = SwingUtilities2.stringWidth(host, fm, getSampleText());

        int y = height * 3 + textGap * 3;
        int x = squareSize * 3 + squareGap * 2 + swatchWidth + width + textGap * 3;
        return new Dimension(x, y);
    }

    public void paintComponent(Graphics g) {
        if (oldColor == null)
            oldColor = getForeground();

        g.setColor(getBackground());
        g.fillRect(0, 0, getWidth(), getHeight());

        if (this.getComponentOrientation().isLeftToRight()) {
            int squareWidth = paintSquares(g, 0);
            int textWidth = paintText(g, squareWidth);
            paintSwatch(g, squareWidth + textWidth);
        } else {
            int swatchWidth = paintSwatch(g, 0);
            int textWidth = paintText(g, swatchWidth);
            paintSquares(g, swatchWidth + textWidth);

        }
    }

    private int paintSwatch(Graphics g, int offsetX) {
        int swatchX = offsetX;
        g.setColor(oldColor);
        g.fillRect(swatchX, 0, swatchWidth, (squareSize) + (squareGap / 2));
        g.setColor(getForeground());
        g.fillRect(swatchX, (squareSize) + (squareGap / 2), swatchWidth, (squareSize) + (squareGap / 2));
        return (swatchX + swatchWidth);
    }

    private int paintText(Graphics g, int offsetX) {
        g.setFont(getFont());
        JComponent host = getColorChooser();
        if (host == null) {
            host = this;
        }
        FontMetrics fm = SwingUtilities2.getFontMetrics(host, g);

        int ascent = fm.getAscent();
        int height = fm.getHeight();
        int width = SwingUtilities2.stringWidth(host, fm, getSampleText());

        int textXOffset = offsetX + textGap;

        Color color = getForeground();

        g.setColor(color);

        SwingUtilities2.drawString(host, g, getSampleText(), textXOffset + (textGap / 2), ascent + 2);

        g.fillRect(textXOffset, (height) + textGap, width + (textGap), height + 2);

        g.setColor(Color.black);
        SwingUtilities2.drawString(host, g, getSampleText(), textXOffset + (textGap / 2), height + ascent + textGap + 2);

        g.setColor(Color.white);

        g.fillRect(textXOffset, (height + textGap) * 2, width + (textGap), height + 2);

        g.setColor(color);
        SwingUtilities2.drawString(host, g, getSampleText(), textXOffset + (textGap / 2), ((height + textGap) * 2) + ascent + 2);

        return width + textGap * 3;

    }

    private int paintSquares(Graphics g, int offsetX) {

        int squareXOffset = offsetX;
        Color color = getForeground();

        g.setColor(Color.white);
        g.fillRect(squareXOffset, 0, squareSize, squareSize);
        g.setColor(color);
        g.fillRect(squareXOffset + innerGap, innerGap, squareSize - (innerGap * 2), squareSize - (innerGap * 2));
        g.setColor(Color.white);
        g.fillRect(squareXOffset + innerGap * 2, innerGap * 2, squareSize - (innerGap * 4), squareSize - (innerGap * 4));

        g.setColor(color);
        g.fillRect(squareXOffset, squareSize + squareGap, squareSize, squareSize);

        g.translate(squareSize + squareGap, 0);
        g.setColor(Color.black);
        g.fillRect(squareXOffset, 0, squareSize, squareSize);
        g.setColor(color);
        g.fillRect(squareXOffset + innerGap, innerGap, squareSize - (innerGap * 2), squareSize - (innerGap * 2));
        g.setColor(Color.white);
        g.fillRect(squareXOffset + innerGap * 2, innerGap * 2, squareSize - (innerGap * 4), squareSize - (innerGap * 4));
        g.translate(-(squareSize + squareGap), 0);

        g.translate(squareSize + squareGap, squareSize + squareGap);
        g.setColor(Color.white);
        g.fillRect(squareXOffset, 0, squareSize, squareSize);
        g.setColor(color);
        g.fillRect(squareXOffset + innerGap, innerGap, squareSize - (innerGap * 2), squareSize - (innerGap * 2));
        g.translate(-(squareSize + squareGap), -(squareSize + squareGap));

        g.translate((squareSize + squareGap) * 2, 0);
        g.setColor(Color.white);
        g.fillRect(squareXOffset, 0, squareSize, squareSize);
        g.setColor(color);
        g.fillRect(squareXOffset + innerGap, innerGap, squareSize - (innerGap * 2), squareSize - (innerGap * 2));
        g.setColor(Color.black);
        g.fillRect(squareXOffset + innerGap * 2, innerGap * 2, squareSize - (innerGap * 4), squareSize - (innerGap * 4));
        g.translate(-((squareSize + squareGap) * 2), 0);

        g.translate((squareSize + squareGap) * 2, (squareSize + squareGap));
        g.setColor(Color.black);
        g.fillRect(squareXOffset, 0, squareSize, squareSize);
        g.setColor(color);
        g.fillRect(squareXOffset + innerGap, innerGap, squareSize - (innerGap * 2), squareSize - (innerGap * 2));
        g.translate(-((squareSize + squareGap) * 2), -(squareSize + squareGap));

        return (squareSize * 3 + squareGap * 2);

    }

    private String getSampleText() {
        if (this.sampleText == null) {
            this.sampleText = UIManager.getString("ColorChooser.sampleText", getLocale());
        }
        return this.sampleText;
    }
}
